Susceptibility of eucalypt taxa to a natural infestation by Leptocybe invasa
Recently, pest occurrence in forest plantations has been increasing influenced by genotypes and environmental conditions such as climate change, thus impacting production negatively. In 2008, the exotic pest Leptocybe invasa (Hym: Eulophidae), known as the blue gum chalcid, was introduced in Brazil...
Saved in:
Published in | New forests Vol. 51; no. 5; pp. 753 - 763 |
---|---|
Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Dordrecht
Springer Netherlands
01.09.2020
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Recently, pest occurrence in forest plantations has been increasing influenced by genotypes and environmental conditions such as climate change, thus impacting production negatively. In 2008, the exotic pest
Leptocybe invasa
(Hym: Eulophidae), known as the blue gum chalcid, was introduced in Brazil causing damage to eucalypt plantations in many regions of the country. To this end, this study evaluated the susceptibility of
Eucalyptus camaldulensis
(one seedlot),
E. grandis
(four seedlots),
E. urophylla
(four seedlots), and the “
E. urograndis
” hybrid (
E. urophylla
×
E. grandis)
(three seedlots) exposed to a natural infestation by
L. invasa
in two seasons (winter and summer). The attack on seedlings was classified in terms of severity as healthy (no pest attack), oviposition (only oviposition signs) and gall formation. The results show a significant higher pest incidence in summer compared to winter. Further,
Eucalyptus urophylla
was the least attacked and 90% of the seedlings were healthy whereas
E. grandis
showed the highest number of seedlings with galls. The
E. urograndis
hybrid showed intermediate results between the two species. Differences in susceptibility were observed between seedlots within species.
Eucalyptus camaldulensis,
which was expected to have the highest incidence of galls, had a high oviposition incidence (60%) and low gall incidence (< 10%), probably due to its provenance. The susceptibility of the different eucalypt families varied significantly with respect to
L. invasa
infestation, and family heritability ranged from 0.27 to 0.68. The genetic control of
L. invasa
is possible through the selection of tolerant and resistant material, considering the species, provenance, and family. |
---|---|
ISSN: | 0169-4286 1573-5095 |
DOI: | 10.1007/s11056-019-09758-1 |